Copper diffusion in solid copper sulfide electrode

✍ Scribed by Sylvie Sanchez; Sophie Cassaignon; Jacques Vedel; Humberto Gomez Meier

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 714 KB
• Volume: 41
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(95)00454-8

✦ Synopsis

The electrochemical behavior of a copper sulfide electrode (Cu,,,,S) in a sulfate bath containing Cu*+ ions is studied by cyclic voltammetry and impedance spectroscopy techniques. Cyclic voltam- metry shows that several cathodic reductions occur at the copper sulfide electrode, one of which involves the copper vacancies as electroactive species. The reaction pathway at the equilibrium potential is established and a diffusion step of the copper vacancies in the copper sulfide electrode is shown. The impedance spectroscopy leads us to determine a diffusion coeflkient of the copper vacancies close to 10-'0cm2 s-l.